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Title: A mathematical model of solid-state dewetting of barium thin films on W (112)

Journal Article · · Mathematical Modelling of Natural Phenomena
 [1]; ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [2];  [2]
  1. Ohio Univ., Athens, OH (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
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Solid state dewetting occurs when a thin solid film is heated. The temperature of dewetting depends on the thickness of the film; dewetting can be observed in the range of 1/3 to 1/2 of the bulk melting temperature. While remaining solid, the film behaves in a manner similar to liquids dewetting and agglomerating to forming islands or droplets. One of the possible mechanisms is the conversion of a metastable thin film geometry into a more stable form. Heating the metastable film gives the film atoms higher mobility, and the films retract, dewetting the surface. This atomic motion can be restricted due to surface anisotropy. Herein we present in situ emission microscopy observations of barium thin films deposited ontoW(112) by thermal evaporation. From the modeling viewpoint, the evolution of the film in this system could be divided in four stages: (i) the nucleation and growth of the thin film as a simply connected region; (ii) formation of droplets/islands/hillocks; (iii) nucleation of holes; (iv) evolution of the components of the disconnected film to their equilibrium state. We present a continuum model that is qualitatively consistent with the evolution of the film observed at the initial stage of the experiment and discuss the later stages of the evolution of surface structures.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Advanced Research Projects Agency (DARPA)
Grant/Contract Number:
SC0012704; N66001-16-1-4040
OSTI ID:
1604619
Report Number(s):
BNL-213714-2020-JAAM
Journal Information:
Mathematical Modelling of Natural Phenomena, Vol. 15; ISSN 0973-5348
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
Solid-solid thin film dewetting
barium
W(112)